Author: Scott Gasch
Date: 16:40:37 10/08/99
Hi, I think my hash table is messed up... I was talking with another programmer about a test position (Fine 70: 8/k7/3p4/p2P1p2/P2P1P2/8/8/K7 w - - bm Kb1). At 19 ply my program had searched nearly a million tree nodes but his was at like 40k or something. It became apparent that this was because his hash was hitting like 99%... mine hits about 30%. My hash is about 500k positions large and I replace positions if the new one has an equal or greater depth than the one in the hash already. I've been over my hashing code carefully and I cannot explain this problem. However I normally do not see anywhere near even a 30% rate -- it's usually more like 2%. My questions are: 1) what kind of hash hit rate (hits / tries * 100) do other programs see in this position and 2) what could affect a hash in this manner? Poor key generation is one but I don't think so... too small is another but I don't think so either... I am at a loss. Thanks again, Scott
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